Some Effects of Mechanically-Produced Unsteady Boundary Layer Flows on Convective Heat Transfer Augmentation

[+] Author and Article Information
G. H. Junkhan

Department of Mechanical Engineering, Iowa State University, Ames, Iowa

J. Heat Transfer 100(1), 25-29 (Feb 01, 1978) (5 pages) doi:10.1115/1.3450498 History: Received May 16, 1977; Online August 11, 2010


Tests of experimental results from augmentation of convective heat transfer coefficients at a gas/solid interface by mechanical disruption of the boundary layer are discussed on both an average and a local basis. The averaged data show that the augmentation obtained depends upon the wake effects of the mechanical device used to produce the disturbance and upon the time required to re-establish the boundary layer after the disturbance has occurred. The local data analysis indicates that the amount of augmentation obtained depends on the relative velocity vector of the fluid with respect to the mechanical device and upon the time behavior of this vector.

Copyright © 1978 by ASME
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